Hi Red,
Sorry to hear about the loss of your grandad...I would suggest you write a letter to him and put it under your pillow asking him to visit you in hes dreams to show you hes ok...they often visit us that way, also look out for scents that would be associated to him, a warmth around you and suddenly thinking about him, small coins laying around that your sure werent there a moment ago, flickering lights or electrical troubles.
Im sure you will start recognising hes prensence around you soon
Homecoming